code: def __init__(self, feed, brk, twitterFeed):
      super(Strategy, self).__init__(feed, brk)
      self.__instrument = "BTC"
  
      # Subscribe to Twitter events.
      twitterFeed.subscribe(self.__onTweet)
  
file_path: pyalgotrade/samples/tutorial_twitter_bitstamp.py
imports: from pyalgotrade import strategy
  from pyalgotrade.bitstamp import barfeed
  from pyalgotrade.bitstamp import broker
  from pyalgotrade.twitter import feed
label_desc: Use image node_id 1 to create a new Strategy object from inherited base classes: strategy with example: obj = Strategy(feed, brk, twitterFeed)